Television apparatus



June 16, 1931. w. M. JONES, JR

TELEVISION APPARATUS Filed April 26, 1930 2 Sheets-Sheet 1 INVENTOR W21Zia 7 Maxim LAD/166 A:

BY Z

x I Z61) ATTORNEY June 16, 1931, w. M. JONES, JR

TELEVISION APPARATUS- Filed April 26, 1930 2 Sheets-Sheet 2 INVENTOR/z'ZZzJww Marian (/0116 BY 71 f 714; ATTORNEY Fig; 3 is'a horizontalsection on the line 3+3, Fig.1;

Patented June 16 1931 :JiUNQI STATES} I Y li e r AR IMON 13. d1" E TERLNWYQ ELE IS N Application jfiled April as;

r in the appended claims. In the-drawings:

vice embodying the "present invention;

Fig. 2 is a'ver'tic'al section on the l ne.

2+2, Fig. '1

" Fig. lis'ia detail view ofthedriving connection between the scanningmember. and the shutter;

Fig. 5 is :a detail view of the shutter Fig. G is a' detail view of thescanning disk; 7 V

Fig; 7 'is a vertical section throughanother embodiment; i I "Fig. 8'shows the interior of the embodis' ment illustrated in Fig. 7'; and- YFig. -9 is a planview ofa shutter having agsingle exposure slot; 7 I *AI scanning member: in the form'of 3; r0; 'tary disk having openings"successively: pre-' sentedto the picture field limitstlie widtho'f thepictureto'the distancebetween the sue:- cessive openings, and the heightof the picture to the number of such openings, or; to be more exact, tothe distancelbetween the first and the last opening (if-the. series"measured from the centeriof rotation" of; the rotarydisk.v By:placingtheopenings in a single convolution about the axis of the disk,the: sizeof the picture: isec'nntrolled by: the

the picture Fig. 1 is afront view of a composing deto employ a rotary:scanningdisk having a v posing ot a picture aha-receivingstation.

APPARA Q 7 1930. Seria1 No.447,713., I sizevofthis convolution." Toobtainalarger picture fromi a 'single convolution'aslarge disk mustrbeemployed. 1 It has been sugr:

gested to forinin' the 'disk a. series-of opens ings in a plurality ofconvolutions,'andthis V has required. .the use-of a'fshutterwhichrwill'I shut 'ofi' those I openings which are not supposed to passthe"*lights*rays, for otherwise two or more openingswill-be.passing; thelight. rays at the same time. A shutter whichzhas been suggested for:confining the lightsrays to one opening when arotary disk having a.series of openings in. a pluralityiof:

-. convolutionszahas been. employed, embodiesa .disk' rotating about'theaxiszofz'the scan-i ning .disk' and having a; single volute= slot; andthis shutter disk zrotated at. av slower speed than that; of the.scanning; diskso that one: rotation of; the shutter'will' take plaee.

while the scanningdisklis rotating a'number of times corresponding to:the-number of iconvolutions in the seriesiof openings vinithe scanningdisk. The slot in the shutter; disk limitsthe width of -the picture ifmade toot narrow-and if made-toowideit. will expose inolrle than oneopening to the passage of 1g t, I i .-V According to this: invention;it. is possible seriesof openings arranged ina plurality o'f'convolutionsfabout the axis of; the disk and to soqcontrol' thelightithat' rays will passthrough only one of the openings *while at thesome time wider. and; longer or higherpicture may bejscannedforsanalyzing s orwcomposing. I 1 1 W; In the drawings are show-nuthreeembodimentsof. the invention designed :for the com- 7 In theembodimentshown in Figs. ..1 to 6;

.1 indicates thesource; oflight, and :2the

scanner in .theform of a scanningdisk rotat: ableiwiththe shaftL3; .asisc ommonll "This scanning diskhas a seriesiof openings ;.4 which-arearranged;onsagipluralitycot.convce lutions about the shaft 3 so as tocover a picture area 5.

Associated with the scanning disk is a' shutter comprising, in thisinstance, a disk 6 having spiral slots 8 and supported by the shaft 9which is eccentric to the axis of turning of the disk 2. The slots areof such shape and the center of the shaft 9 is so situated that thatportion of the convolution which is opposite the picture area formssubstantially the arc of travel of an opening in the shutter as ittravels over the picture area.

The speed of travel is, in this instance, at a ratio of 4 to 1 to thespeed of travel of the scanning disk, and this maybe effected byproviding a small external gear 10 on the shaft 3 shaft 9. V

In the embodiment illustrated in Figs. 7 and 8, 1 indicates'the sourceof light and 2 a the scanning diskwhich is mounted on a shaft 3 the sameas in the other embodiment and has the openings 4 arranged in aplurality of convolutions.

The shutter in thisembodiment is in the form ofadisk 6 having aplurality of arcuate slots 8* extending substantially tangential: to theaxis of rotation of the disk 6 These slots are of such shape and widththat when sweeping across the picture area, 5 each will cover the wholepicture area. The scanning disk 2 rotates a sufficient number oftimesduring thernovementof each slotover the picture area to cause eachopening in the plurality of convolutions to be'presented to. such slot.As four convolutions of op enings are providedin the scanning disk, thenthe latter must rotate four times for each slot or twenty-fourtimes forthe six slots or one rotation of the shutter. To eflect this, a speedincreasing mechanism may be interposed between the scanning disk 2 andthe shutter disk '6 T hismechanism,

in this instance, comprises a pinion 12 on the shaft v3 meshing with agear .1 3 on a shaft 14 which carries a pinion l5 meshing with a gear 16on the shaft 9 of the shutter,

. said shaft being eccentricto the axis of turning of the shaft 3. 1

The .form ofthe slots 8 is such that each slot first strikes at its.outer end the upper portion of the picture area as the firstopening 'ofthe outer convolution reaches the area. The slot and opening thentraveltoget-her across the picture area until the next opening reachesthe picture area when another portion of the same slot uncovers suchnext opening, the slot moving across the picture area with the openingAt no time is more than one openingexposed. by the slot although eachslot successively opens all of the-openings in all of the convolutionsof the. scanning disk. Y

When a-single opening 8 in a shutter is geared to an internal gear ll'onthe employed, as shown in Fig. 9, this Opening may be in the shape of aspiral and when the center of the spiral is placed a short distance fromthe center of the scanning disc a portion of the spiral can be madenearly to align with the are cut by any opening in the scanning discwhose radius is the same as the distance of that part of thespiral fromthe center of the scanning disc.

lVhen using a single spiral it becomes necessary to use a transparentmaterial across the opening to hold. the parts of the shutter in place.This difliculty can be avoided byusing more than one spiral, as

shown "in Figs. Band 8, each extending but 7 made to tally, with the arcof any disc opening, by placing the shutter center a correspondingly.further distance from the center of the scanning disc. 'This however,necessitates increasing the gear ratios, so that the most satisfactoryshutter willbe one with'but two spiral openings. By placing the'shuttercenter a considerable distance from the center \ofthe scanning discseveral nearly radial openings may be used in the shutter.

. In all embodimentsof the invention, the shutter rotates about an axiseccentric to the axis of. rotation of the scanning disk and theshutteris lots are. so formed that they permit-the scanning of av widevfield without at'the same time exposing more than one opening in thescanning disk. In'two 'embodiments, a plurality of slots of novel formare employed, making it possible to provide a stronger shutter disk thanwhen a single volute-slot. extends entirely about the axis of rotationof the disk.

What I claim as myinvention and desire to secure by LettersPatent is:

1. A scanning mechanism for the analyzing or composition of pictures intelevision comprising a rotary scanning disk having exposure openingsarranged in a plurality of convolutions about the axis of rotation ofthe disk, and a rotary disk shutter arrangedto turn about an axiseccentric to the axis of rotation of the scanning disk and provided witha curved'exposure slot which will open the entire area ofsaid openingssuccessively, and means for connecting the shutter. and the scanningdisk for rotative movement together so that on the turning oftheshutter, the scanning disk will carry the entire series ofopeningspast the curved slot in the; shutter. v

2. A scanning mechanism for the analyzing and composition of pictures intelevision comprising a rotary scanning disk provided with a series ofopenings arranged Ill) in a plurality; of convolutions about. the Q lit)ing a plurality of curved slots arranged about the aXis of rotation ofthe shutter disk, means for supporting the two disks for rotation abouttwo different centers so that each slot in the shutter disk can travelover the entire series of openings in the scanning disk on the rotationof the latter, and means for turning the two disks at such relativespeed that, the entire series of openings in the scanning disk Will bepresented successively to the curved slots in the shutter disk.

WILLIAM MARTIN JONES, JR.

